Galaxy number counts from K = 10 to K = 23
Galaxy number counts from K = 10 to K = 23
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星系编号从 K = 10 到 K = 23
DOI：
10.1086/187020
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
R. Wainscoat
中科院分区：
文献类型：
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作者：
J. Gardner;L. Cowie;R. Wainscoat
我们提出了K波段星系数计数从四个调查范围12<K<23，并将它们与其他现有的数据进行比较。我们表明，在K = 17时，计数的斜率从0.67变化到0.26。类似地，我们发现B-K色的中值在K = 17时发生转变，比K = 18暗的星系群迅速变蓝。我们表明，B-波段和K-波段的计数是一致的，这种颜色效应。与被动演化模型进行了比较，结果排除了宇宙学常数非零的平坦宇宙模型。场星系的数量在K = 17处发生变化，在那里，人们会期望看到K * 椭圆星系的红移为z = 1
We present K-band galaxy number counts from four surveys in the range 12<K<23 and compare them to other existing data. We show that the slope of the counts changes at K≃17 from 0.67 to 0.26. Similarly, we show that the median B-K color turns over at K≃17, and the population of galaxies fainter than K≃18 rapidly becomes bluer. We show that the B-band and the K-band number counts are consistent with this color effect. The number counts are compared to passive evolution models, and the flat universe with nonzero cosmological constant model is ruled out by the data. The population of field galaxies changes at K≃17, where one would expect to see K * elliptical galaxies at a redshift of z≃1